Application of Ultrasonic Spectroscopy to Polymers and Liquid Crystal

A new measuring system for ultrasonic spectroscopy was constructed, utilizing piezoelectric polymer films as wide-band transducers. By conducting FFT analysis on the ultrasonic pulses transmitted through specimens, the frequency spectra of attenuation over a wide range of about 1 to 10 MHz could be obtained simultaneously. In a test of its performance, this measuring system was successfully applied to nondestructive testing in various polymers and a study of the nematic-isotropic phase transition in liquid crystal MBBA.